Dirigible lamp



R. WILCOX.

DIRIGIBLE LAMP.

APPLICATION FILED DEC-24, 191?.

1,329, 47. Patented Feb. 3,1920.

- INVEN T05. WITNESS .Rascoe v wd 7 BY A TTORNEY ROSGQE WILCOX, OF LOMBAR-D, ILLINOIS.

DIRIGIBLE LAMP.

Specification of Letters Patent.

Patented Feb. 3, 1920.

Application filedmecember 24, 1917. Serial No. 208,574.

ll) all whom 1125mm concern:

Be it known that I, Roscoe \VILcox, a citizen of the United States, residing at Lombard, in the county of Dir-gage and State of Illinoiahave invented certain new and useful lmynoven enls' in Dirip ible Lamps, of which the following is a specification.

This invention relates to dirigible lamps, and has for its object the provision of suit able adjustable mechanism for controlling the lamp when it is being tilted and for holding it firmly in position after it has been tilted; audit has for a further object the arrangement and positioning of such mechanism so that it cannot easily be tampered with.

This invention is an improvement on my invention relating to dirigible lamps which is fully illustrated and described in Patent No. 1,169,898 issued to me February 1st, 1916; and attention is directed to that patent for further information in reference to the original invention on which the present invention is based.

0f the aecoi'upanying drawings Figure l is a side elevation of a dirigible lamp, embodying the features of my invention; Fig. 2 is a front elevation thereof with portions of the lamp broken away; and Fig. 3 is a detail view of the adjustable controlling mechanism.

In the application of dirigible lamps to automobiles and to other uses, it is desirable to have the lamps at all times held firmly. A slight vibration or shaking causes a serious movement of the long beam of light, and is otherwise objectionable. At the same time the means to accomplish this purpose must not seriously resist the manipulation of the lamp, as the operator should be able to change to the direction in which the beam of light is cast quickly and easily. Also it is often desirable to adjust the force with which the lamp is held in lace; and it is not desirable to have the adjusting means easy of access to meddlers.

With these matters in view I provide the following mechanism: The lamp 5 is tiltably supported by thefork 6, by means of a pivot 7 passing through the end 8 of each branch of the fork 6, and through the hearing; 9 in the casing of the lamp. The head 10 of the pivot passes into a recess 11 of the fork end, and is nonrotatable in the recess; the pivot, however, may be rotated with reference to the fork end by pushing the head out of the recess, as the shank end of the pivot is rotatable in the fork end 8 as well as in the bearing 9. The shank ofthe pivot projects into the lamp chamber 12 of the casing; and a conical spring 13 is fixed in any suitable manner to the flange 16 and to the pivot end ll, so uS at all times to tend to rota'tcthe pivot amlthe bearing with reference to each other.

The tilting of the lamp is produced by operating, in any suitable manner, the cable 15.. pulling on the cable the lamp is tilted upwardly, the spring 13 yielding but causing the lamp to resist the cable sufii eiently to hold the amp steady. By releasing the cable the spring is allowed to tilt the lamp downwardly, and at the same time to keep the cable taut and the lamp steady. If it is desired to adjust the tension of the spring it is necessary only toopen up the casing of the lamp, push the pivot 7 outwardly, until the head 10 passes out of the recess 11, turn it more or less one way or the other as may be desired, and then replace the head in the recess.

In order to prevent the pivot working outwardly, by jarring or otherwise, and thus allowing the springto be loosened by rotation of the pivot, the spring is made conical and is arranged so that when in place normally it forces the pivot inwardly, thus making it necessary for considerable force to be used in )ushing the pivot head out of the recess.

i by this arrangement it will be seen that any degree of adjustment of thespring is readily obtained, and at the same time variations in the tension of the spring by meddlers, or inadvertently, are not likely to occur, owing to the necessity for opening the lamp casing.

I claim as my invention:

1. In a tiltable lamp, a support, a pivot,

said pivot being slidable with reference to said support and being nonrotatable in reference thereto when in one position, but

rotatable with reference thereto when in another position, said pivot rotatably connecting the lamp with said support, and resilient means tending to rotate said lamp and to move said pivot to its nonrotatable position with reference to said support.

2; In a tiltable lamp, a support, a pivot slidably mounted in said support and corn nectingrotatably the lamp with said sup:- port; saidpivot when in one position being nonrotatablo with reference to said support,

but when in another position being rotatable with reference thereto; and a spring operatively connecting said lamp with said pivot; said spring tending to rotate said lamp with reference to said pivot and to move said pivot to its nonrotatable position.

3. In a tiltable lamp, a lamp casing, a support having a recess therein, a pivot rotatablv connecting said lamp and said casing and projecting into said casing, said pivot having a head normally positioned i said recess and nonrotatable with reference thereto but slidable outwardly With reference to said recess; and a spring positioned Within and operatively connecting said casing With sc'd'pivot and tending to rotate said casing with reference to said pivot and to force said pivot head into said recess.

t. A fixed member, a second member, to be rotated with reference to said fixed member, a pivot, each of said members having an opening theretlniough, said pivot passing through each of said openings, and being slidable therein and being rotatable with reference to said members When in one position but nonrotatable With reference to sa1d fixed member when in a second pos1t1on;a comically coiled spring, one end of said spring being fixed to one end of said 5. The combination of a supporting "frame, a lamp holder tiltably supported by said frame, a member connecting said frame and said holder rotatably connected to said holder, and resilient means connecting said member to said holder andtending to produce relative rotation of said member and holder, said member being slidably mounted in said frame and being rotatable With reference to said frame when in one position relative thereto, and said resilient member being arranged to resist the sliding of said member to its adjustable position.

In testimony whereof, I hereunto set my hand.

ROSCOE WILCOX.- 

